UM 7926/7934/7942/7950/7966 Direct Seeding Machine Instruction and spare parts Edition Revised Language Original user manual

Warranty This Underhaug product is guaranteed against manufacturing and material defects for one year. Components not produced by Underhaug, such as electrical and hydraulic equipment, power take-off shafts, and tires, are covered according to the original manufacturer's warranty terms. The following components have limited warranty terms due to their function: tires, skirts, blade tips, breaker pins, fuses, hydraulic seals in pumps, motors, valves, cylinders, etc., as found on new machines. Deterioration due to wear and tear during use is considered normal for these parts. Therefore, the warranty...

Safety Before operating the machine Before operating, adjusting, or repairing the machine, the user, repairer, and owner must familiarize themselves with the safety instructions provided in this manual (Fig 1). Be attentive and cautious when working with agricultural machinery. Read and take note of the safety instructions in this manual. Safety at work is your responsibility General safety instructions Exercise caution when other people or animals are nearby Never start the machine when people or animals are close to the machine and tractor. Never stand between the tractor wheels and the machine...

The tractor engine should be stopped and the ignition key removed before performing any repair work, lubrication, or other maintenance on the machine. (Fig. 6). Ensure that all covers are in good condition and properly mounted. Do not attempt to start the machine until this has been done. Damaged covers should be repaired or replaced immediately. (Fig. 7). Pay special attention to all protective covers related to the power take-off shafts. Replace damaged covers. Safety chains must always be attached to the machine and/or tractor to prevent the protective sleeves from rotating. Be cautious when...

When disconnecting the machine and leaving the tractor/machine Set all hydraulic functions to the neutral position when disconnecting the machine. Lower the movable working components to the ground or set them in the transport position and secure them. If the machine is equipped with parking blocks, these should be used. Do not allow children to play or remain near agricultural machines. (Fig. 9). Drive Safely Remember, you are responsible – carelessness and negligence can cause serious injury or even death. (Fig. 10). Check the wheel bolts and the connection between the machine and tractor before...

Supplementary Safety Instructions for UM 7926/7934/7942/7950/7966 Direct Seeding machines This machine is marked with this warning sign. If the sign is damaged, it must be replaced. Warning sign 220532 (fig. 1). Remember! Read and understand the instruction manual before using the equipment and before adjusting and performing maintenance. Warning Sign 220532 (Fig. 1). Caution. Read and understand the instruction manual before using the equipment, and before adjusting or performing maintenance. Warning Sign 220538 (Fig. 2). Due to the high risk of crushing, it is essential to keep people at a...

Technical data

Preparation of a new machine The seeder is delivered fully assembled from the factory, except for the drive wheels and drive chains for the seed boxes. These must be installed afterward. The machine is delivered securely strapped to a transport pallet. Once the packing straps are released, the machine can be lifted off the pallet and connected to the tractor's three-point hitch. Assembly of drive wheels and chains First, mount the drive wheel (6) with the arm and chain drive onto the mounting bracket on the frame using the bolt (12) for the sprocket, as shown in the figure. Then, attach the drive...

Transport Due to the large transport width, a detachable transport drawbar has been developed for towing on roads. This is an optional feature for the 3.0 m seeder and standard for machines larger than this. The towing drawbar kit has article number 196100. Seed Box The seeder is equipped with a seed box specifically designed for sowing grass seeds. Inside the seed box, a dedicated stirring shaft ensures even seed distribution and prevents bridging within the box. The seeding system operates on a sliding roller principle. The output rollers feature longitudinal rollers that can be adjusted in...

Adjustment of Seed Output The seed rates indicated in the table on the machine are approximate. The properties of a seed variety can vary from year to year and depend on the humidity. Therefore, it is recommended to perform a calibration test before starting the seeding operation to ensure that the set seed rate is accurate. This is only a guideline table, and we always recommend performing a calibration test!

Calibration Test 1. Find the seed variety (or equivalent) to be sown in the sowing table. 2. Refer to the table to determine how many kg/ha should be sown and the corresponding setting on the adjustment handle. The adjustment handle is located at the end of the seed box and has a scale from 0-21. Each rotation corresponds to a 3 mm adjustment of the seeding rollers. Turning clockwise reduces the seed rate, while turning counterclockwise increases it. 3. Check that the sprockets have the correct gearing and lift the machine using the tractor’s hydraulics. 4. Place a low, long box, plastic sheet,...

ROTATION TABLE IN DEKARES Calibration test on a 3.0-meter seeder. Rotate the drive wheel 46 times, which corresponds to 1/40 hectare (250 m2). The seed dispensed is weighed, and the measured seed amount is multiplied by 40. This gives the seed rate in kg/ha. Note: 1 hectare = 10 decares = 10,000 m2.

Frame with Seed Skis The seed skis (seed plates) with arm and pressure spring are mounted in a parallelogram configuration on the frame. The seed ski itself is attached to the arm in such a way that it is movable, allowing it to absorb small unevenness in the ground. The suspension arm is pushed downward by a pressure spring, and the spring arm also has a stopper that keeps the seed ski lifted off the ground when the machine is raised by the three-point hitch. Adjustment of Pressure on Seed Skis The pressure on the seed skis is adjusted by raising or lowering the hydraulic cylinders on the depth...